Range of quantizer to avoid clipping of transmitted signal in MATLAB

I have a signal ,say

s = sqrt(0.5) * (randn(1,10000) + 1i * randn(1,10000))

After quantizing it to say 512 levels, I observe that there is clipping of the original signal. I would like to know if there is a method to calculate the range of quantizer for a signal with complex normal distribution (signal s defined above) in a way that the original signal is not clipped.